Bearing



T. V. BUCKWALTER.

I BEARING. APPLICATION FILED FEB. 2. I918. RE NEWED JUNE 5.1920.

1,437,834, Patented Dec. 5, 1922.

2 SHEETS-SHEET 1.'

T. V. 'BUCKWALTER.

BEARING APPLICATION FILED FEB. 2,1918. RENE-WED JUNE 5,1920. 1,457,834, Patented Dec. 5, 1922.

2 SHEETS-SHEET 2- I g M/ 2/ 7 nveniora .jmflzrji'uclrwalzen gy 0 MA Patented Dec. 5, 1922.

TRACY V. BUCKWALTER, OF CANTON, OHIO, ASSIGNOR TO TIMKEN ROLLER BEARING COMPANY, OF CANTON, OHIO, A CORPORATION OF OHIO.

BEARING.

Application filed February 2, 1918, Serial No. 215,073. Renewed June 5, 1920. Serial No. 386,917.

To all w 7mm it may concern.

Be it known that I, TRACY V. BUCKWAL- TER, a citizen of the United States, residing at Canton, in the county of Stark and State of Ohio, have invented certain Improvements in Bearings, of which the following is a specification. My invention relates more particularly to hearing rolls for anti-friction uses, and my primary object is to provide superior rolls with elimination of defects in operation due to imperfections in workmanship.

In the manufacture of rolls of the character heretofore in general use, ground separately with surfaces having straight elements for distributing the loads from end to end of the rolls, the desirable precision and uniformity of construction cannot be obtained, with the result that loads are not uniformly distributed to the constituent parts of the bearing, the loads carried by particular rolls are not properly distributed and an accurately constructed bearing with uniformly distributed loads may fail because the ends of a roll with straight elements throughout the length of its periphery are liable to chip off under an evenly distributed load that would not injuriously affect such roll otherwise.

In accordance with my invention, the pe ripheries of the rolls have three concentric surfaces or sections comprising an intermediate surface or section extending the greater part of the length of the roll, having straight line elements parallel to or forming an angle with the axis for the greater part of the length of the periphery, and end surfaces or sections inclined to or drawn inwardly from the intermediate surface.

These surfaces are preferably formed simultaneously, with resulting true concentricities thereof, by an improved method which comprises burnishing a number of rolls simultaneously by rolling between dies under pressure, with resulting improvements in the texture of the bearing surfaces, in the relation of the bearing surfaces, in the accuracy of construction of the respective rolls, in the uniformity of the rolls, and in the saving of metal by the permitted truncation or elimination of endsotherwise required for holding the rolls in the usual practice of grinding them.

The desideratum is attained of carrying the radial load through straight line bearing contacts of substantial length without loading or so loading the ends of the rolls as to cause the common injuries due thereto.

The characteristic features of my invention are more specifically disclosed in the following description of types of my improvements and the accompanying drawings in illustration thereof.

In the drawings, Fig. l isa side elevation of a conical roll having the ends of its periphery reduced, Fig. 2 is a side elevation of a cylindrical roll having the ends of its periphery reduced, in accordance with my invention, which is .illustrated diagrammatically thereby, and Fig. 3 is a sectional view through the axis of a bearing embodying the invention.

The roll illustrated in Fig. 1 has the conical surface 1 at its larger and for taking thrust loads, and the conical surface 1' at its smaller end for control. The periphery ofthe roll for taking radial loads has the intermediate conical bearing surface 2 extending say three-fourths of the length of the roll, with the reduced conical surface 2 at its larger end and the reduced conical surface 2" at its smaller end, the elements of the surface 2 forming a slightly smaller angle and the elements of the surface 2 forming a slightly greater angle with the axis of the roll than the elements of the surface 2. The angle a,

between the surface 2 and the respective end surfaces 2 and 2", by' which the latter sur faces are drawn toward the axis of-the roll in receding from the former surface, is preferably just suflicient to relieve such end surfaces of load initially and until the use of the bearing comprising a set of rolls has effected sufficient wear to distribute the load equally to the several rolls therein, for it will be understood that with the highest attainable degree of accuracy in workmanship the several parts of a new bearing involve eccentricities of construction which result in an unequal distribution of the load.

The roll illustrated in Fig. 2 has the in.- termediate cylindrical bearing surfaces 3 ex tending, say, three fourths of its length, and the conical end bearing surfaces 8 tapering therefrom, the end surfaces being drawn in from the intermediate surface by the angle a of such extent as to throw the load on the intermediate surface initially and until wear has eliminated eccentricities in the bearing.

As illustrated in Fig. 3, the rollers are placed between the concentric bearing members 4 and 5 which are provided with the usual bearing surfaces adapted to be generated by. the revolution of a straight line, parallel'to the axis of revolution in using a substantially cylindrical roller as shown in Fig. 2 or an ular to the axis of revolution to generate the conical surfaces 6 and 7 in using a substantially conical roller as shown in Fig. l, the rollers shown in Fig. 3 being of the type illustrated in Fig. 1. It will be observed that the elements of the surfaces 6 and 7 which make contact with the surfaces 2 are parallel thereto and make the same angle with the respective end surfaces 2 and 2" so that until the bearings are run in the ends of the rollers or the surfaces 2 and 2" are relieved of the load or protected from actions which frequently cause failures.

Having described my invention 1 claim:

1. The combination with bearing members' provided with concentric surfaces having straight line elements, of bearing rolls each having a periphery with a median section having straight line elements adapted to roll into coincidence with elements of said members and slightly tapered end surfaces forming initially small angles with said concentric surfaces and adapted to be brought into bearing relation with said surfaces by wear of said median section.

2. The combination with bearing members having concentric surfaces, of bearing rolls each having a peripheral surface provided with a median section having elements adapted to conform with said concentric surfaces and end sections making slight angles with said concentric surfaces initially and adapted to be brought into bearing relation with said concentric surfaces by wear on said median section.

3. The combination with bearing members having concentric conical surfaces, of conical bearing rolls each having a peripheral surface with a median section extending the greater part of the length thereof and having elements adapted to conform with said concentric conical surfaces, said peripheral surface having end sections making small acute angles with the respectiveconcentric conical surfaces and adapted to be brought into bearing relation therewith by wear on said median section.

4. A bearing roll having a periphery comprising a median section with straight line elements and end sections with elements bent inwardly therefrom to prevent contact initially with the cooperating bearing elements and adapted to be brought into contact there with by wear on said intermediate section.

5. A hearing roll having a periphery comprising a median section with straight line elements extending the greater part of the length of the roll and end sections with tapered portions of slight angularity to said median section and adapted to become bearing portions by wear on said median section.

6. A bearing roll having a periphery comprising a conical median section extending the greater part of the length of the roll and end sections of slight angularity to said median section and adapted tobe brought into unbroken continuity with said median section'as a result of wear in use.

In testimony whereof I have hereunto set my name this 28th day of January, 1918.

TRACY v. BUCKWALTER. 

